Animation Event not working with animation speed multiplier enabled?

So, suddenly my event at the end of an animation clip was not working. After a long time of messing around, i tried to turn off my Multiplier on my clip, and then it worked again. Is this a bug or intended?

In any case, i now got a problem. I need to know when my animation end, after having applied different multiplier values. If animation clip length is 3, and multiplier is 0.5, then how long is total time? Or rather, if clip is x seconds and multiplier is y float, then what to do to get time of end of clip?